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Helgrindur (also known as Lysuhóll or Lysukard) is one of Iceland's smallest volcanic systems. It consists of a chain of small alkali olivine basaltic cinder cones and vents along a WNW-ESE line cutting across the central Snaefellsnes Peninsula in western Iceland. The slightly arcuate line of Quaternary vents extends to the northern coast of the peninsula. Helgrindur is the central of three volcanic systems occupying the peninsula. The latest eruption from Helgrindur is undated, but the volcanic field has been active during the Holocene.
The Global Volcanism Program is not aware of any Holocene eruptions from Lysuholl. If this volcano has had large eruptions (VEI >= 4) prior to 10,000 years ago, information might be found on the Lysuholl page in the LaMEVE (Large Magnitude Explosive Volcanic Eruptions) database, a part of the Volcano Global Risk Identification and Analysis Project (VOGRIPA).
This compilation of synonyms and subsidiary features may not be comprehensive. Features are organized into four major categories: Cones, Craters, Domes, and Thermal Features. Synonyms of features appear indented below the primary name. In some cases additional feature type, elevation, or location details are provided.
|Lysuskard | Lysuhóll|
|Feature Name||Feature Type||Elevation||Latitude||Longitude|
|Lysuhyrna||Vent||64° 51' 0" N||23° 11' 0" W|
|Raudakular||Cone||540 m||64° 52' 0" N||23° 15' 0" W|
|Lysuhöll, Iceland's smallest volcanic system, consists of a chain of small cinder cones and vents along a WNW-ESE line cutting diagonally across the Snæfellsnes Peninsula in the center of the photo. The cones and vents of the Lysuhöll volcanic system, seen here from the ENE, are located between the snow-covered Helgrindur mountains in the foreground and the glacier-covered Snæfellsjökull volcano in the background. The latest eruptions from Lysuhöll occurred during the Holocene.
Photo by Thorvaldur Bragason, Iceland Geodetic Survey (courtesy of Richie Williams, U.S. Geological Survey).
|An aerial view looking east down the Snaefellsnes Peninsula shows the Bláfeldarhraun lava flow in the foreground, which originated from a pyroclastic cone in the highlands. The cone and flow are part of the Helgrindur (Lysuhóll) volcanic system, which consists of a chain of small alkali olivine basaltic cinder cones and vents along a WNW-ESE line cutting across the central Snaefellsnes Peninsula.
Photo by Oddur Sigurdsson, 1983 (Icelandic National Energy Authority).
|The terminus of the Bláfeldarhraun lava flow is seen in the middle ground to the left of the farm houses. The flow originated from the pyroclastic cone on the left-center horizon and descended in the large lava cascade visible in the center of this view from the south. The flow is one of several Holocene lava flows of the Helgrindur (Lysuhóll) volcanic system on the Snaefellsnes Peninsula.
Photo by Lee Siebert, 2008 (Smithsonian Institution).
The following references have all been used during the compilation of data for this volcano, it is not a comprehensive bibliography. Discussion of another volcano or eruption (sometimes far from the one that is the subject of the manuscript) may produce a citation that is not at all apparent from the title.
Gudmundsson A T, 1986b. Iceland-Fires. Reykjavik: Vaka-Helgafell, 168 p.
Jakobsson S P, 1972. Chemistry and distribution pattern of recent basaltic rocks in Iceland. Lithos, 5: 365-386.
Johannesson H, 1982. Summary of the geology of Snaefellsnes. Arbok Ferdafelags Islands 1982, p 151-172 (in Icelandic).
Johannesson H, Saemundsson K, 1998. Geological map of Iceland, 1:500,000. Tectonics. Icelandic Inst Nat Hist, Reykjavik.
Kjartansson G, 1968. Geological map of Iceland, sheet 2, west-central Iceland. Icelandic Museum Nat Hist, 1:250,000 geol map.
Steinthorsson S, et al., 2002. Catalog of Active Volcanoes of the World - Iceland. Unpublished manuscript.
Thordarson T, Hoskuldsson A, 2008. Postglacial eruptions in Iceland. Jokull, 58: 197-228.